THINNING IMPACTS ON TREE GROWTH

THINNING IMPACTS ON FOREST GROWTH

LECTURER: Dr. Pham Minh Toai
STUDENT: Nguyen Huu Dung
ID: 1353091031


MAIN CONTENTS

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THINNING DEFINITION
KEY FACTORS TO ESTABLISH THINNING PLANS
POSITIVE AND NEGATIVE IMPACTS OF THINNING ON FOREST
GROWTH

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CONCLUSION


THINNING DEFINITION
In forestry, thinning is the selectve removal of trees, primarily undertaken to
improve the growth rate or health of the remaining trees. Overcrowded trees are
under compettve stress from their neighbors. Thinning may be done to increase
the resistance of the stand to environmental stress such as drought, insect
infestaton, extreme temperature, or wildfre,etc
(Russell T. Graham et al 1999)

KEY FACTORS TO ESTABLISH THINNING PLANS

MANAGER DECISIONS
FOREST TYPES
AND FOREST
GROWTH RATE

AGE OF FOREST

Sources: Garry Kerr et al 2011., thinning pratice- a silvicultural guide.


POSITIVE IMPACTS OF THINNING ON FOREST GROWTH


POSITIVE IMPACTS OF THINNING ON FOREST GROWTH

D: dominant

I: intermediate

C: co-dominant

S: suppressed

Sources: CLE ELUM, Washington news


POSITIVE IMPACTS OF THINNING ON FOREST GROWTH

Sources: David J Suggett et al., 2013


NEGATIVE IMPACTS OF THINNING ON FOREST GROWTH


NEGATIVE IMPACTS OF THINNING ON FOREST GROWTH

Sources: JOSEF HAKL et al 2007., The Effect of the Soil Compacton […] on root biomass.


NEGATIVE IMPACTS OF THINNING ON FOREST GROWTH


NEGATIVE IMPACTS OF THINNING ON FOREST GROWTH

(*) marginal thinning intensity
Sources: Ygui Zheng et al 2005


CONCLUSION

THINNING IS PROFITABLE

REDUCING WILDFIRE RISK
THINNING AND
FOREST GROWTH RATE HAS
THINNING REDUCE STRESS FOR
FOREST HEALTH

THINNING INCREASE EROSION RATE
AND SOIL COMPACTION

INTER-RELATIONSHIP


REFERENCES

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Gary Kurr et al 2011., Thinning Practce A Silvicultural Guide https
://www.forestry.gov.uk/